Carrier FB Series Service And Maintenance Instructions
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Carrier FB Series Service And Maintenance Instructions

Residential fan coil units
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FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF
Residential Fan Coil Units
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Fan Coil Description and Troubleshooting. . . . . . . . . . . . . . . . . . . . . 2
FV, FT4, FG4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
InteliSense™ Technology (FT4, FT5). . . . . . . . . . . . . . . . . . . . . 13
FFM and FMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electric Heater Function and Troubleshooting . . . . . . . . . . . . . . . . . 24
FZ, PF4, PF5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Description of Electric Heater Components . . . . . . . . . . . . . . . . 24
FFM, FMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Description of Electric Heater Components . . . . . . . . . . . . . . . . 25
Leak Dissipation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Operation (Models with R-454B Refrigerant) . . . . . . . . . . . . . . . 25
System Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
FF1E, FFMA, FMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Refrigerant Flow-Control Devices. . . . . . . . . . . . . . . . . . . . . . . . 28
Piston Body Cleaning and Replacement . . . . . . . . . . . . . . . . . . . 30
Aluminum Coil Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Installation - A-Coil Units Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Installation - Slope Coil Units Only. . . . . . . . . . . . . . . . . . . . . . . . . 32

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or
use can cause explosion, fire, electrical shock, or other conditions which
may cause death, personal injury or property damage. Consult a
qualified installer, service agency, or your distributor or branch for
information or assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with kits or accessories
when installing.
Follow all safety codes. Wear safety glasses, protective clothing and
work gloves. Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in literature and
attached to the unit. Consult local building codes and the current editions
of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical Code
CSA C22.1.
Recognize safety information. This is the safety-alert symbol
you see this symbol on the unit and in instruction manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION.
These words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices which
Service and Maintenance Instructions
may result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
UNIT OPERATION AND SAFERTY HAZARD
Failure to follow this warning could result in personal injury or death.
R-454B systems operate at higher pressures than R-410A systems. Do
not use R-410A service equipment or components on R-454B
equipment. Ensure service equipment is rated for R-454B.
PERSONAL INJURY AND PROPERTY DAMAGE
HAZARD
Failure to follow this warning could result in property damage, personal
injury, or death.
For continued performance, reliability, and safety, the only approved
accessories and replacement parts are those specified by the equipment
manufacturer. The use of non-manufacturer approved parts and
accessories could invalidate the equipment limited warranty and result
in fire risk, equipment malfunction, and failure. Please review
manufacturer's instructions and replacement part catalogs available
from your equipment supplier.
HOT TUBE WARNING
Failure to follow this caution could result in personal injury and/or
property damage.
Refrigerant lines can reach or exceed 130 °F (54 °C). Avoid contact
with the vapor header or vapor line, especially in Heating Mode. Do not
service A2L refrigerant (ex; R-454B) fan coils while these components
are hot to avoid risk of ignition source.

INTRODUCTION

These fan coil units are designed for flexibility in a variety of
applications that meet upflow, horizontal, or downflow requirements.
Units are available in 1-1/2 through 5 ton nominal cooling capacities.
Factory-authorized, field-installed electric heater packages are available
in 3 through 30 kilowatts.
FMA family Fan Coils are designed with application flexibility in mind
and are suitable for closet and flush mount installations. Units are
available with field-installed electric heat with circuit breaker. Units are
. When
used indoors as the fan coil for split-system heat pumps or air
conditioners. The FMA5L uses a refrigerant piston metering device and
a 3 speed PSC Motor. FMA5X uses a TXV and a 5 speed multi-tap ECM
Motor for efficiency. Units are available in 18,000 through 36,000 Btuh
nominal cooling capacities.
NOTE: Nuisance sweating may occur if the unit is installed in a humid
location with low airflow.
WARNING
!
WARNING
!
CAUTION
!

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Summary of Contents for Carrier FB Series

  • Page 1: Table Of Contents

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF Residential Fan Coil Units Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the may result in minor personal injury or product and property damage. installation.

  • Page 2: Fan Coil Description And Troubleshooting

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Units are designed for upflow application only. Local codes may linit HEATING—When thermostat calls for heating and FAN switch is set this free-air-return type unit to installation in single-level applications.
  • Page 3 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions the relay to close its normally-open contacts, turning on fan. (2.) Check sequencer/relay No. 1 and plug wiring. Yellow wire When thermostat no longer calls for the fan, the signal sent to should be connected to Pin No.

  • Page 4: Fb4C, Fj4, Fx4D, F54, Pf4, Ff1E, And Fz (Odd Sizes)

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions blows when there is a high current draw on transformer, high Transformer Failure: voltage applied to low-voltage circuit, or a direct secondary short. Check 208V and 230V transformer connections.
  • Page 5 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions • The motor is communicated through 24VAC signals to the 1, 2, 3, 4, 5 and C (common) terminals. Not all taps are programmed, if low voltage is applied to an non-programmed terminal, the motor will not operate, which is normal.

  • Page 6: Fv, Ft4, Fg4

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions A230463 Fig. 7 – ECM Motor, post-2023 FV, FT4, FG4 Constant Air Flow Unlike fan coils using induction motors where static pressure affects airflow, these fan coils are constant airflow units.
  • Page 7 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Low-Voltage Circuit Fusing and Reference • 200 percent current opening time of five seconds maximum low-voltage circuit fused board-mounted Electrical Connections automotive-type fuse placed in series with transformer SEC2 and R Twenty-one 0.110-in pin terminals are used to provide programming circuit.
  • Page 8 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Table 2 – Motor and Modules – post-2023 (Mid and Deluxe Tier) Motor Signal Configuration Fan Coil Model Family Size Motor Type Motor P/N Control Module P/N Translator P/N...
  • Page 9 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions SYSTEM DIAGRAM HEATER/MOTOR SEC1 SEC2 5 AMP AUX1 " HUM1 " AUX2 " HUM2 " " DIODE LOGIC AUX HEAT AC/HP SYSTEM AC/HP CFM ON/OFF...
  • Page 10 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions motor. Energizing W without G will result in 25% lower airflow Table 5 – Airflow Adjustment Table delivery. The selected delay profile is not active in this mode. Unit Size AUX Heat Range (kW/CFM) Super Comfort Heat Mode...
  • Page 11 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions 2. MED – provides 80 percent of Y/Y2 Cool airflow. low-voltage circuit, or a direct secondary short. When there is a high current drawn on transformer, it is most likely because transformer has 3.
  • Page 12 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions The ECM/ICM motor used with this product contains two parts: the 6. If the unit contains a motor signal translator box (16X4), repeat control module and the motor winding section.

  • Page 13: Intelisense™ Technology (Ft4, Ft5)

    Connected Portal and Service Tech App TO EAC The Carrier Connected portal and Service Tech App provide a connection between the dealer/service tech and the homeowner's system. They can provide information about the homeowner's account, A98625 equipment configuration, operating performance and fault code history, Fig.
  • Page 14 Communication Loss and Board Fault transformer secondary connections are made at SEC1 and SEC2 connectors. Refer to thermostat advanced installation and configuration instructions found at carrier.hvacpartners.com/InteliSense. FE4/FE5A/FE5B Troubleshooting ( Table 8 – RAT/SAT Sensor Values NOTE: Always check high and low voltage supply to the fan coil components.
  • Page 15 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions outdoor unit and the R, C, Y, O, W outdoor unit terminal strip connections and will display Status Code 16, System Communication Fault, on amber STATUS LED.
  • Page 16 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Using Motor LED in Troubleshooting 2. Check motor wiring harness to be sure all wiring complies with wiring diagram description, makes a complete circuit from The MOTOR LED is connected to the blower motor communication line connector to connector and is not shorted.
  • Page 17 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions 4. Make sure heater size installed is an approved size for outdoor unit No further fan coil troubleshooting information will be available at the and fan coil sizes installed.
  • Page 18 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions ADVANCED TROUBLESHOOTING: 5. After reestablishing power, you should receive Fault Code 44, and the motor LED should be off. 6. Place a jumper across the R and G terminals on the low voltage Status terminal block 7.

  • Page 19: Ffm And Fma

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions 4. Inspect electrical connections for tightness and controls for proper If motor does not run, test motor for an open winding or a winding operation each heating and cooling season.
  • Page 20 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions NOTE: The following sequence of operation is based on units installed with PSC motor and Time Delay Printed Circuit Board (PCB), and all FMA5L units.
  • Page 21 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions FFM, FMA4X, FMA5L, FMA5X FFMANP(018,024,030,036) and FMA4P, and 30 or 90 seconds on the FFMANP(019,025,031,037), FMA4X and FMA5L/X. These fan coils use a TXV. The TXV’s are preset at the factory and do not need adjustment for reliable operation.
  • Page 22 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions NOTE: Time delay PCB replaced Time delay relay in new production models. A150305 Fig. 20 – FFMA, FMA4, FMA5 (Sizes 18 & 24) Expanded View - Duct Components, Blower & Electrical Parts A13137 Fig.
  • Page 23 FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions * Louvered Grill Cover is an accessory A14214 Fig. 22 – FFMA, FMA4, FMA5 (Sizes 30 & 36) Expanded View - Case NOTE: Time delay PCB replaced Time delay relay in new production models.

  • Page 24: Electric Heater Function And Troubleshooting

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions A13140 Fig. 24 – FFMA, FMA4, FMA5 (Sizes 30 & 36) Expanded View - Evaporator Parts & Drain Pan Electric Heater Function and Troubleshooting KFC and KFD Electric Heat Relay KFC and KFD electric heater packages have relays controlling the heater FB4, FE4, FE5B, FF1E, FG5, FH4, FJ4, FJ5, FT4,...

  • Page 25: Ffm, Fma

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions present but no output, replace PCB. If output is present, replace signal (G) from thermostat. The PCB includes a normally open relay relay.

  • Page 26: Troubleshooting

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Flashing 8 Table 14 – Required Operational Checks to Ensure Proper Dissipation System Function Verify wiring of all "Y" and "W" wires in the applicable wiring diagram. Normal Operation Table 16 –...

  • Page 27: Ff1E, Ffma, Fma

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Filter Assembly for reassembly. The blower motor and wheel may be cleaned by using a vacuum with a soft brush attachment. To clean or replace air filter, push plastic connectors toward center of 8.

  • Page 28: Refrigerant Flow-Control Devices

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Cooling Coil, Drain Pan, and Condensate Drain 5. With blower wheel, inlet ring, and motor mount still attached to motor, place motor on flat, horizontal surface, shaft up. Mark The cooling coil is easily cleaned when it is dry.
  • Page 29 TXV operates the same as a standard TXV previously explained. 5. The needle valve on pin carrier is spring-loaded, which also exerts However, when the system is switched to heating mode of operation, pressure on underside of diaphragm via push rods, which closes refrigerant flow is reversed.

  • Page 30: Piston Body Cleaning And Replacement

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions TEFLON SEAL PISTON BRASS PISTON HEX BODY RETAINER BRASS HEX NUT A93530 Fig. 28 – Refrigerant Flow-Control Device (For FB and FMA4P) Piston Body Cleaning and Replacement CAUTION CAUTION...

  • Page 31: Installation - A-Coil Units Only

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions Before installation of replacement coil, verify the piston is the correct 11. Insulate the entire TXV body and outlet tubing to prevent sweating. orifice size.

  • Page 32: Installation - Slope Coil Units Only

    FB, FE, FF1E, FFM, FG, FH, FJ, FMA, FT, FV, FX, FY, FZ, F54, PF: Service and Maintenance Instructions 3. Disconnect condensate drain line. COIL SUPPORT COLUMN WARNING COIL TOP SEAL (PARTIALLY HIDDEN) COIL TO CASING SCREW PERSONAL INJURY HAZARD DISTRIBUTOR Failure to follow this caution may result in personal injury.
  • Page 33 Condensate Pan Assembly Slope Coil Ski A14307 Fig. 33 – Slope Coil Component Location (1996 and Later) © 2024 Carrier. All rights reserved. Edition Date: 7/24 Catalog No: SM-FANCOIL-10 A Carrier Company Replaces: SM-FANCOIL-09 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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